Winch auxiliary Battery.

Consensus seems to suggest it is risky to rely on one battery only for winching. For those who have done it. What were the battery specs you chose? Following the winch recommendation you end up with a far too large/heavy car battery. I would think full load winching would be a rare occurrence. Particularly if you upsized the winch to begin with, or used double line pull mostly.
Thanks in advance.
Haitch